Iperf between UDM Pro <> Win10 PC with 2.5 GBPS is not symmetrical why?

I have a UDM connected to my win PC via SFP+ PC has a 2.5g nic card. Trying to determine why the speeds arent idenctical?

There are no other devices in between the UDM PRO and PC

When running the test from the PC >> UDM I see the following speeds Desktop\iperf> .\iperf3.exe -c 192.168.86.1 Connecting to host 192.168.86.1, port 5201 [ 4] local 192.168.86.247 port 50881 connected to 192.168.86.1 port 5201 [ ID] Interval Transfer Bandwidth [ 4] 0.00-1.00 sec 271 MBytes 2.27 Gbits/sec [ 4] 1.00-2.00 sec 257 MBytes 2.16 Gbits/sec [ 4] 2.00-3.00 sec 268 MBytes 2.25 Gbits/sec [ 4] 3.00-4.00 sec 253 MBytes 2.12 Gbits/sec [ 4] 4.00-5.01 sec 247 MBytes 2.06 Gbits/sec [ 4] 5.01-6.00 sec 253 MBytes 2.14 Gbits/sec [ 4] 6.00-7.00 sec 254 MBytes 2.13 Gbits/sec [ 4] 7.00-8.00 sec 238 MBytes 2.00 Gbits/sec [ 4] 8.00-9.00 sec 241 MBytes 2.02 Gbits/sec [ 4] 9.00-10.00 sec 258 MBytes 2.16 Gbits/sec

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[ ID] Interval Transfer Bandwidth [ 4] 0.00-10.00 sec 2.48 GBytes 2.13 Gbits/sec sender [ 4] 0.00-10.00 sec 2.48 GBytes 2.13 Gbits/sec receiver

iperf Done.

When running the test from the UDM >> PC I see the following speeds

root@ubnt:/# iperf3 -c 192.168.86.247 Connecting to host 192.168.86.247, port 5201 [ 4] local 192.168.86.1 port 53452 connected to 192.168.86.247 port 5201 [ ID] Interval Transfer Bandwidth Retr Cwnd [ 4] 0.00-1.00 sec 96.6 MBytes 810 Mbits/sec 892 18.5 KBytes [ 4] 1.00-2.00 sec 92.5 MBytes 776 Mbits/sec 819 18.5 KBytes [ 4] 2.00-3.00 sec 95.2 MBytes 798 Mbits/sec 871 17.1 KBytes [ 4] 3.00-4.00 sec 92.6 MBytes 777 Mbits/sec 995 18.5 KBytes [ 4] 4.00-5.00 sec 94.3 MBytes 791 Mbits/sec 973 17.1 KBytes [ 4] 5.00-6.00 sec 90.0 MBytes 755 Mbits/sec 948 17.1 KBytes [ 4] 6.00-7.00 sec 95.4 MBytes 800 Mbits/sec 1010 17.1 KBytes [ 4] 7.00-8.00 sec 92.5 MBytes 776 Mbits/sec 1116 18.5 KBytes [ 4] 8.00-9.00 sec 93.7 MBytes 786 Mbits/sec 878 18.5 KBytes [ 4] 9.00-10.00 sec 92.5 MBytes 776 Mbits/sec 986 17.1 KBytes

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[ ID] Interval Transfer Bandwidth Retr [ 4] 0.00-10.00 sec 935 MBytes 785 Mbits/sec 9488 sender [ 4] 0.00-10.00 sec 935 MBytes 784 Mbits/sec receiver